dc.creator | Mitri, S. | en |
dc.creator | Medvedev, D. | en |
dc.creator | Kontou, S. | en |
dc.creator | Gorbova, E. | en |
dc.creator | Demin, A. | en |
dc.creator | Tsiakaras, P. | en |
dc.date.accessioned | 2015-11-23T10:39:46Z | |
dc.date.available | 2015-11-23T10:39:46Z | |
dc.date.issued | 2015 | |
dc.identifier | 10.1016/j.ijhydene.2015.05.020 | |
dc.identifier.issn | 3603199 | |
dc.identifier.uri | http://hdl.handle.net/11615/31078 | |
dc.description.abstract | In the present work, the steady-state current-overpotential characteristics of the Fe|BaCe<inf>0.5</inf>Zr<inf>0.3</inf>Y<inf>0.08</inf>Yb<inf>0.08</inf>Cu<inf>0.04</inf>O<inf>3-δ</inf>|Fe interface as a function of the gas phase composition and temperature are investigated. To this purpose a BaCe<inf>0.5</inf>Zr<inf>0.3</inf>Y<inf>0.08</inf>Yb<inf>0.08</inf>Cu<inf>0.04</inf>O<inf>3-δ</inf> dense ceramic material is successfully synthesized by solid state synthesis and sintered at 1400°C. Then its crystal structure, ceramic and electrical properties are investigated. It is found that the ceramic has a high relative density (more than 90%) and acceptable proton conductivity (1.5 and 6.8mScm-1 at 500 and 900°C, respectively). On the as prepared BaCe<inf>0.5</inf>Zr<inf>0.3</inf>Y<inf>0.08</inf>Yb<inf>0.08</inf>Cu<inf>0.04</inf>O<inf>3-δ</inf> electrolyte disk, three thin Fe porous layers are deposited by painting on both sides (three electrode system), which is then immersed in a tubular single-chamber continuous electrochemical reactor.The polarization measurements are carried out in the temperature range between 500 and 700°C and at three different H<inf>2</inf>/He wet (3% steam) compositions. The apparent anodic and cathodic charge transfer coefficients (Tafel region) are found to be: α <inf> a </inf>=α <inf> c </inf>=0.8, while the apparent activation energy is calculated to be approximately 0.55±0.05eV. It is also found that by increasing the hydrogen concentration the current density increases, especially at higher temperature values. © 2015 Hydrogen Energy Publications, LLC. | en |
dc.source | International Journal of Hydrogen Energy | en |
dc.source.uri | http://www.scopus.com/inward/record.url?eid=2-s2.0-84930743228&partnerID=40&md5=0716c1306a14f5610773c5cf79cbf743 | |
dc.subject | IT-SOFCs | en |
dc.subject | Perovskite | en |
dc.subject | Polarization study | en |
dc.subject | Proton conductor | en |
dc.subject | Solid electrolyte | en |
dc.subject | Activation energy | en |
dc.subject | Ceramic materials | en |
dc.subject | Charge transfer | en |
dc.subject | Copper | en |
dc.subject | Crystal structure | en |
dc.subject | Interface states | en |
dc.subject | Phase interfaces | en |
dc.subject | Polarization | en |
dc.subject | Sintering | en |
dc.subject | Solid oxide fuel cells (SOFC) | en |
dc.subject | Ytterbium | en |
dc.subject | Zirconium | en |
dc.subject | Apparent activation energy | en |
dc.subject | High relative densities | en |
dc.subject | Hydrogen concentration | en |
dc.subject | Polarization measurements | en |
dc.subject | Proton conductors | en |
dc.subject | Three electrode-system | en |
dc.subject | Solid electrolytes | en |
dc.title | Polarization study of Fe|BaCe<inf>0.5</inf>Zr<inf>0.3</inf>Y<inf>0.08</inf>Yb<inf>0.08</inf>Cu<inf>0.04</inf>O<inf>3-δ</inf>|Fe electrochemical cells in wet H<inf>2</inf> atmosphere | en |
dc.type | journalArticle | en |